THE PHYSIOLOGICAL ACTION OF SNAKE-VENOMS 175 
Venom of Notechis scutatus (syn. Hoplocephalus curtus; the 
Tiger Snake of Australia) :— 
Rabbit (by intravenous in- 
jection, according to 
Tidswell) ... ee ... 0°00006 gramme per kilogramme 
Venom of Vipera russellii (Daboia) :— 
Rabbit (by intravenous in- 
jection, according to G. 
Lamb)... des ... 0°00005 gramme per kilogramme 
Venom of Lachesis gramineus (Green Pit-Viper, India) :— 
Rabbit (by intravenous in- 
jection, according to G. 
Lamb) ... Be ... 0°002 gramme per kilogramme 
Venom of Crotalus adamanteus (Californian Rattle-Snake) :— 
Rabbit (by intravenous in- 
jection, according to Mc- 
Farland, G. Lamb, and 
Flexner and Noguchi) ... 0°00025 gramme per kilogramme 
It will have been seen from the foregoing figures, that the 
respective sensitiveness of the dog, cat, rabbit, guinea-pig, rat, 
mouse, and frog, with regard to the same venom, is in no way 
proportional to the weight of these animals. 
The species mentioned are, per unit of weight, more or less 
resistant to intoxication ; and, on experimenting with other animals, 
as for instance the monkey, pig, ass, and horse, we find that 
the monkey is much more susceptible to intoxication than the dog, 
and that the ass is extremely sensitive (0°010 gramme of Cobra- 
venom is sufficient to kill it), while the horse is less so, and the pig 
is by far the most resistant. 
The same weight of dry Cobra-venom, let us say 1 gramme to 
be precise, will enable us to kill 1,250 kilogrammes of dog, 2,000 
kilogrammes of rabbit, 2,500 kilogrammes of guinea-pig, 1,430 
kilogrammes of rat, or 8,333 kilogrammes of mouse. 
